@misc{indiciae319b557d1e0b,
  title = {Two modes of evolution.},
  author = {L Van Valen},
  year = {1974},
  doi = {10.1038/252298a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/4431447/},
  note = {Source identifier: 4431447}
}